\documentclass{article}
\usepackage{amssymb,amsmath,amscd,concmath}
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\begin{document}
\begin{equation*}Girls = Time * Money
Time = Money     //Time is Money
Girls = Money^2
Money = Evil^0.5     //Money is the root of all evil
Girls = (Evil^0.5)^2
Girls = Evil Q. E. D.\end{equation*}
\end{document}
